M. Clerici, M. Peccianti, B. Schmidt, L. Caspani, M. Shalaby, M. Giguére, A. Lotti, A. Couairon, F. Légaré, T. Ozaki, D. Faccio, R. Morandotti
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A scaling mechanism for increasing the terahertz emission from ionization of air
A significant enhancement of the terahertz generation efficiency via two-color laser-induced air ionization, up to 10-3, is observed with increasing pump wavelength. Terahertz peak fields up to 4.4 MV/cm were obtained using 400 μJ pulse energy.